Over a million developers have joined DZone.

Default Dictionary

·
I always want to do this, like I did in Perl.

>> d = DefaultDict(0)
>> d[key] += 1     # no need to use d.get or d.setdefault

>> d = DefaultDict([])  # similarly with list value
>> d[key].append(item)

See the implementation by Peter Norvig (of AI & Google fame) 
here
Topics:

The best of DZone straight to your inbox.

SEE AN EXAMPLE
Please provide a valid email address.

Thanks for subscribing!

Awesome! Check your inbox to verify your email so you can start receiving the latest in tech news and resources.
Subscribe

{{ parent.title || parent.header.title}}

{{ parent.tldr }}

{{ parent.urlSource.name }}